If the request to the callback URL fails (does not return {'error': 0}), will the document server attempt to try again? I would like to be able to resend the callback in case of an unexpected error with our application/server/network/etc. I can see that the doc_callback entry in postgresql still exists, so this should be possible?

Thank you. In the mean time, how can I detect this condition? In my tests it looks as if the failed callback remains in the doc_callbacks table and there are no results related to that document key with status code 8 in the task_results table, but I cannot be sure that is correct.